eWON Family - eWON Support

5.12.3 Tag name convention
IO Server Name S73&400
Topic Name
Item Name
General Reference Guide IO Servers Configuration
The Item Name can contain the PLC address where the value is polled, or not. If the address is also specified at the topic level, the address
specified at Tag level will be ignored.
5.12.3.1 Value Name
The syntax is the following:
A
B
C
ValueName, Global Device Address PLC address is defined Tag by Tag
ValueName Topic PLC Address is used.
Important: All the addresses are always in BYTES (except for Counter and Timer that are objects)
Note: The Modifier can by omitted, the modifier in bold will be used (DB type must have a modifier).
(*) Important: See “Tags are stored as Float” on page 67
Table 100: S73&400 IO server - Tag name convention table
Symbol Memory Type Modifier Address
DBx Data Block number x B, C, W, S, D, L, F Byte offset
M Internal Memory B, C, W, S, D, L, F Byte offset
C Counter W, S Object number
T Timer W, S Object number
I Discrete Inputs B, C, W, S, D, L, F Byte offset
Q Discrete Outputs B, C, W, S, D, L, F Byte offset
PI Peripheral Inputs B, C, W, S, D, L, F Byte offset
PQ Peripheral Outputs B, C, W, S, D, L, F Byte offset
Table 101: S7 300-400 Memory types
Symbol Modifier value range
B Byte 0 .. 255
C signed Byte -128 .. 127
W Word 0 .. 65535
S signed Word -32768 .. 32767
D DWord 0 .. 4294967296 (*)
L signed DWord -2147483648 .. 2147483647 (*)
F Float +/- 3.4e38
Table 102: S7 300-400 Modifiers
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